All the 'evidence' is circumstantial isnt it? they dont have any definitive proof that Dexter is the BHB I thought...

Not to mention, I think 'Dexter Morgan, you are under arrest.' is one of Dexters day dreams... there is a ton of proof Doakes is the BHB but nothing they can really prove makes the BHB Dex. Thats why they threw in the 'Are you trying to frame my brother?' part of the preview...

never let Dexter previews fool you lol.

That being said, season 8 being a season about the trial would be really dumb. Dexter would certainly run away and has a plan for 'if' he gets caught... that was shown to us earlier in the premiere.